3. The genetic code is commaless, which means that no codon is reserved for punctuations. It means that after one amino acid is coded, the second amino acid will be automatically, coded by the next three letters and that no letters are wasted as the punctuation marks (Fig.
Summer solstice is the first day of summer - it's usually between June 20th and June 23rd. In 2016, the summer solstice takes place on June 20th. We know it's summer because the earth's axis tilts toward the sun from June to September - this means warmer weather and longer days.
This date coincides with the summer solstice which has the longest daylight period of the year (the shortest in the southern hemisphere.) On the day of the summer solstice, the north pole gets 24-hours of sunlight, while the south pole gets 24-hours of darkness!